package com.imooc.service.impl;

import com.imooc.converter.OrderMaster2OrderDTOConverter;
import com.imooc.dataobject.OrderDetail;
import com.imooc.dataobject.OrderMaster;
import com.imooc.dataobject.ProductInfo;
import com.imooc.dto.CartDTO;
import com.imooc.dto.OrderDTO;
import com.imooc.enums.OrderStatusEnum;
import com.imooc.enums.PayStatusEnum;
import com.imooc.enums.ResultEnum;
import com.imooc.exception.SellException;
import com.imooc.repository.OrderDetailRepository;
import com.imooc.repository.OrderMasterRepository;
import com.imooc.service.OrderService;
import com.imooc.service.ProductService;
import com.imooc.service.WebSocket;
import com.imooc.utils.KeyUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

/**
 * OrderServiceImpl
 * 订单实现
 *
 * @author leon.cheng
 * @date 2018/11/20 17:03
 **/
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Autowired
    private ProductService productService;
    @Autowired
    private OrderDetailRepository orderDetailRepository;
    @Autowired
    private OrderMasterRepository orderMasterRepository;
    @Autowired
    private WebSocket webSocket;

    /**
     * 创建订单
     *
     * @param orderDTO
     */
    @Override
    @Transactional
    public OrderDTO create(OrderDTO orderDTO) {
        String orderId = KeyUtil.genUnique();

        BigDecimal orderAmount = new BigDecimal(BigInteger.ZERO);
        //1.查询商品（数量，价格）
        for (OrderDetail orderDetail : orderDTO.getOrderDetailList()) {
            ProductInfo productInfo = productService.findOne(orderDetail.getProductId());
            if (productInfo == null) {
                throw new SellException(ResultEnum.PRODUCT_NOT_EXIST);
            }
            //2.计算订单总价
            orderAmount = productInfo.getProductPrice()
                    .multiply(new BigDecimal(orderDetail.getProductQuantity()))
                    .add(orderAmount);

            //订单详情入库
            BeanUtils.copyProperties(productInfo, orderDetail);
            orderDetail.setDetailId(KeyUtil.genUnique());
            orderDetail.setOrderId(orderId);
            orderDetailRepository.save(orderDetail);
        }

        //3.写入订单数据库（主表和子表）
        OrderMaster orderMaster = new OrderMaster();
        orderDTO.setOrderId(orderId);
        BeanUtils.copyProperties(orderDTO, orderMaster);
        orderMaster.setOrderId(orderId);
        orderMaster.setOrderAmount(orderAmount);

        orderMasterRepository.save(orderMaster);
        //4.扣库存
        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList()
                .stream().map(e -> new CartDTO(e.getProductId(), e.getProductQuantity()))
                .collect(Collectors.toList());
        productService.decreaseStock(cartDTOList);
        webSocket.sendMessage("有新的订单:"+orderId);
        return orderDTO;
    }

    /**
     * 查询单个订单
     *
     * @param orderId
     */
    @Override
    public OrderDTO findOne(String orderId) {

        Optional<OrderMaster> optionalOrderMaster = orderMasterRepository.findById(orderId);
        if (optionalOrderMaster == null||!optionalOrderMaster.isPresent()) {
            throw new SellException(ResultEnum.ORDER_NOT_EXIST);
        }
        OrderMaster orderMaster=optionalOrderMaster.get();
        List<OrderDetail> orderDetailList = orderDetailRepository.findByOrOrderId(orderId);
        if (CollectionUtils.isEmpty(orderDetailList)) {
            throw new SellException(ResultEnum.ORDERDETAIL_NOT_EXIST);
        }
        OrderDTO orderDTO = new OrderDTO();
        BeanUtils.copyProperties(orderMaster, orderDTO);
        orderDTO.setOrderDetailList(orderDetailList);
        return orderDTO;
    }

    /**
     * 查询订单列表
     *
     * @param buyerOpenid
     * @param pageable
     */
    @Override
    public Page<OrderDTO> findList(String buyerOpenid, Pageable pageable) {
        Page<OrderMaster> orderMasterPage = orderMasterRepository.findByBuyerOpenid(buyerOpenid, pageable);
        List<OrderDTO> orderDTOList = OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent());

        Page<OrderDTO> orderDTOPage = new PageImpl<>(orderDTOList, pageable, orderMasterPage.getTotalElements());
        return orderDTOPage;
    }

    /**
     * 取消订单
     *
     * @param orderDTO
     */
    @Override
    @Transactional
    public OrderDTO cancel(OrderDTO orderDTO) {
        OrderMaster orderMaster = new OrderMaster();
        //判断订单状态
        if (!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
            log.error("【取消订单】订单状态不正确，orderId={},orderStatus={}", orderDTO.getOrderId(), orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.CANCEL.getCode());
        BeanUtils.copyProperties(orderDTO, orderMaster);
        OrderMaster updateResult= orderMasterRepository.save(orderMaster);
        if(updateResult==null)
        {
            log.error("【取消订单】更新失败，orderMaster={}",orderMaster);
            throw  new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }
        //返回库存
        if(CollectionUtils.isEmpty(orderDTO.getOrderDetailList()))
        {
            log.error("【取消订单】订单中无商品详情，orderDTO={}",orderDTO);
            throw  new SellException(ResultEnum.ORDER_DETAIL_EMPTY);
        }
        List<CartDTO> cartDTOList=orderDTO.getOrderDetailList().stream()
                .map(e->new CartDTO(e.getProductId(),e.getProductQuantity()))
                .collect(Collectors.toList());
        productService.increaseStock(cartDTOList);
        //如果已支付，需要退款
        if(orderDTO.getPayStatus().equals(PayStatusEnum.SUCCESS))
        {
            //TODO
        }
        return orderDTO;
    }

    /**
     * 完结订单
     *
     * @param orderDTO
     */
    @Override
    @Transactional
    public OrderDTO finish(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode()))
        {
            log.error("【完结订单】订单状态不正确，orderId={},orderStatus={}", orderDTO.getOrderId(), orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }
        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.FINISHED.getCode());
        OrderMaster orderMaster=new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult= orderMasterRepository.save(orderMaster);
        if(updateResult==null)
        {
            log.error("【完结订单】更新失败，orderMaster={}",orderMaster);
            throw  new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }
        return orderDTO;
    }

    /**
     * 支付订单
     *
     * @param orderDTO
     */
    @Override
    @Transactional
    public OrderDTO paid(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode()))
        {
            log.error("【订单支付完成】订单状态不正确，orderId={},orderStatus={}", orderDTO.getOrderId(), orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //判断支付状态
        if(!orderDTO.getPayStatus().equals(PayStatusEnum.WAIT.getCode()))
        {
            log.error("【订单支付完成】订单支付状态不正确，orderDTO={}", orderDTO);
            throw new SellException(ResultEnum.ORDER_PAY_STATUS_ERROR);
        }
        //修改支付状态
        orderDTO.setPayStatus(PayStatusEnum.SUCCESS.getCode());
        OrderMaster orderMaster=new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult= orderMasterRepository.save(orderMaster);
        if(updateResult==null)
        {
            log.error("【订单支付完成】更新失败，orderMaster={}",orderMaster);
            throw  new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }
        return orderDTO;
    }
    /**
     * 查询订单列表
     *
     * @param pageable
     */
    @Override
    public Page<OrderDTO> findList( Pageable pageable) {
        Page<OrderMaster> orderMasterPage = orderMasterRepository.findAll(pageable);
        List<OrderDTO> orderDTOList = OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent());
        Page<OrderDTO> orderDTOPage = new PageImpl<>(orderDTOList, pageable, orderMasterPage.getTotalElements());
        return orderDTOPage;
    }
}
